Earth’s ‘Bigger, Older Cousin’ Maybe Doesn’t Even Exist

The planet, known as Kepler-452b, was believed to be about 60 percent larger than our planet and within the habitable zone of its star.

In 2015, to great fanfare, NASA announced a planet discovery considered a milestone in the hunt for another Earth. But now some researchers say it's not clear that this planet actually exists.

(Image credit: NASA Ames/JPL-Caltech/T. Pyle)

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